Thermostat repair and replacement in Port St. Lucie

Veteran Owned Business verified member 378772025 Best of Florida Regional Award winner, Excellence in HVAC ServiceBBB Accredited Business, A+ rating

Thermostat repair can make a good AC look broken

The screen is blank, or it says 74 and the house feels like 80. A bad thermostat makes a healthy AC look broken. Thermostat repair is a cheap place to start.

We check the wiring and power first. Then we repair it, replace it, or put in a smart one.

Smart thermostats, set up right

We install compatible smart thermostats and test both heating and cooling before we leave. A smart thermostat only saves money when it's wired correctly, has a common wire where it needs one, and is programmed for how you actually live.

What the visit covers

  • Thermostat diagnostics
  • Replacement of failing thermostats
  • Smart thermostat installs
  • Wiring and common-wire fixes

Field notes

Jobs we've finished in Port St. Lucie

May 04, 2026 · Port St. Lucie, FL

Thermostat replacement, Port St. Lucie

A thermostat that reads wrong makes the unit run longer than it has to. We replaced this one and checked it against a real temperature reading.

See every job pin

What happens when you call

Tell us what the thermostat shows and what the house feels like. JD usually picks up. If he's under a house or on a roof, someone calls you back. Ask about the diagnostic fee and we'll tell you before anyone drives out.

(772) 203-2571

Next door

We run calls in the towns next door too

Same trucks, same hourly pay, same rules.

Also see the main page for this service.

Good to know

What Port St. Lucie homeowners ask us

Yes. We check the wiring and power first, then replace a failing thermostat or put in a compatible smart one and test heating and cooling before we leave.
That depends on what failed and on the equipment. We tell you the number after we look at the unit, and if replacing it is on the table, you get both numbers.
No. Everyone here is paid hourly, not on commission. When a repair will hold, that's the recommendation.
Yes. We answer 24/7. Sundays and holidays are billed at double time.

Right now

The unit is down and it's hot

(772) 203-2571

Tell us what it's doing. Blowing warm, not blowing at all, water on the floor, a noise that's new. Say how long it's been like that. We'll tell you what it sounds like and when we can be there.

Reviews

What Port St. Lucie homeowners say after the truck leaves

4.9 stars across 167 Google reviews. Licensed and insured.

★★★★★

“AC quit; called Jonathan; fixed within the hour & put cost into MAINTENANCE since was drain line (AND did all the maintenance, too). 2 weeks and AC quit again. Called Jonathan (JD) hoping was just the capacitor- NOPE, the MOTOR. I told him I couldn’t swing that. He checked a…”

FrancE DesrosiersPort St. Lucie · Google review

Read all 167 Google reviews

Licensed CAC1822339

Request Thermostat repair and replacement in Port St. Lucie

Tell us what the unit is doing and when it started. We'll call back to set a time.

(772) 203-2571

Repairs over $500 can be financed, with approved credit.

Harmony Air LLC

5173 NW Aljo Court

Port St Lucie, FL 34986

Open 24/7 · License # CAC1822339

Checking open times…

By submitting, you agree to our Privacy Policy.

CALL NOW